content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2012, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
   * Other names may be trademarks of their respective owners.]
   *
   * ----------------------
   * XYShapeAnnotation.java
   * ----------------------
   * (C) Copyright 2003-2012, by Ondax, Inc. and Contributors.
   *
   * Original Author:  Greg Steckman (for Ondax, Inc.);
   * Contributor(s):   David Gilbert (for Object Refinery Limited);
   *                   Peter Kolb (patch 2809117);
   *
   * Changes:
   * --------
   * 15-Aug-2003 : Version 1, adapted from
   *               org.jfree.chart.annotations.XYLineAnnotation (GS);
   * 21-Jan-2004 : Update for renamed method in ValueAxis (DG);
   * 20-Apr-2004 : Added new constructor and fixed bug 934258 (DG);
   * 29-Sep-2004 : Added 'fillPaint' to allow for colored shapes, now extends
   *               AbstractXYAnnotation to add tool tip and URL support, and
   *               implemented equals() and Cloneable (DG);
   * 21-Jan-2005 : Modified constructor for consistency with other
   *               constructors (DG);
   * 06-Jun-2005 : Fixed equals() method to handle GradientPaint (DG);
   * ------------- JFREECHART 1.0.x ---------------------------------------------
   * 24-Oct-2006 : Calculate AffineTransform on shape's bounding rectangle
   *               rather than sample points (0, 0) and (1, 1) (DG);
   * 06-Mar-2007 : Implemented hashCode() (DG);
   * 16-Jun-2012 : Removed JCommon dependencies (DG);
   *
   */
  
  package org.jfree.chart.annotations;
  
  import java.awt.BasicStroke;
  import java.awt.Color;
  import java.awt.Graphics2D;
  import java.awt.Paint;
  import java.awt.Shape;
  import java.awt.Stroke;
  import java.awt.geom.AffineTransform;
  import java.awt.geom.Rectangle2D;
  import java.io.IOException;
  import java.io.ObjectInputStream;
  import java.io.ObjectOutputStream;
  import java.io.Serializable;
  
  import org.jfree.chart.HashUtilities;
  import org.jfree.chart.axis.ValueAxis;
  import org.jfree.chart.ui.RectangleEdge;
  import org.jfree.chart.util.ObjectUtilities;
  import org.jfree.chart.util.PaintUtilities;
  import org.jfree.chart.util.PublicCloneable;
  import org.jfree.chart.plot.Plot;
  import org.jfree.chart.plot.PlotOrientation;
  import org.jfree.chart.plot.PlotRenderingInfo;
  import org.jfree.chart.plot.XYPlot;
  import org.jfree.chart.util.SerialUtilities;
  
  /**
   * A simple <code>Shape</code> annotation that can be placed on an
   * {@link XYPlot}.  The shape coordinates are specified in data space.
   */
  public class XYShapeAnnotation extends AbstractXYAnnotation
          implements Cloneable, PublicCloneable, Serializable {
  
      /** For serialization. */
      private static final long serialVersionUID = -8553218317600684041L;
  
      /** The shape. */
      private transient Shape shape;
  
      /** The stroke used to draw the shape's outline. */
      private transient Stroke stroke;
  
      /** The paint used to draw the shape's outline. */
      private transient Paint outlinePaint;
  
      /** The paint used to fill the shape. */
      private transient Paint fillPaint;
  
      /**
       * Creates a new annotation (where, by default, the shape is drawn
       * with a black outline).
       *
       * @param shape  the shape (coordinates in data space, <code>null</code>
       *     not permitted).
       */
      public XYShapeAnnotation(Shape shape) {
          this(shape, new BasicStroke(1.0f), Color.BLACK);
      }
  
      /**
       * Creates a new annotation where the shape is drawn as an outline using
       * the specified <code>stroke</code> and <code>outlinePaint</code>.
       *
       * @param shape  the shape (<code>null</code> not permitted).
       * @param stroke  the shape stroke (<code>null</code> permitted).
       * @param outlinePaint  the shape color (<code>null</code> permitted).
       */
      public XYShapeAnnotation(Shape shape, Stroke stroke, Paint outlinePaint) {
          this(shape, stroke, outlinePaint, null);
      }
  
      /**
       * Creates a new annotation.
       *
       * @param shape  the shape (<code>null</code> not permitted).
       * @param stroke  the shape stroke (<code>null</code> permitted).
       * @param outlinePaint  the shape color (<code>null</code> permitted).
       * @param fillPaint  the paint used to fill the shape (<code>null</code>
       *                   permitted.
       */
      public XYShapeAnnotation(Shape shape, Stroke stroke, Paint outlinePaint,
                               Paint fillPaint) {
          super();
          if (shape == null) {
              throw new IllegalArgumentException("Null 'shape' argument.");
          }
          this.shape = shape;
          this.stroke = stroke;
          this.outlinePaint = outlinePaint;
          this.fillPaint = fillPaint;
      }
  
      /**
       * Draws the annotation.  This method is usually called by the
       * {@link XYPlot} class, you shouldn't need to call it directly.
       *
       * @param g2  the graphics device.
       * @param plot  the plot.
       * @param dataArea  the data area.
       * @param domainAxis  the domain axis.
       * @param rangeAxis  the range axis.
       * @param rendererIndex  the renderer index.
       * @param info  the plot rendering info.
       */
      @Override
      public void draw(Graphics2D g2, XYPlot plot, Rectangle2D dataArea,
                       ValueAxis domainAxis, ValueAxis rangeAxis,
                       int rendererIndex,
                       PlotRenderingInfo info) {
  
          PlotOrientation orientation = plot.getOrientation();
          RectangleEdge domainEdge = Plot.resolveDomainAxisLocation(
                  plot.getDomainAxisLocation(), orientation);
          RectangleEdge rangeEdge = Plot.resolveRangeAxisLocation(
                  plot.getRangeAxisLocation(), orientation);
  
          // compute transform matrix elements via sample points. Assume no
          // rotation or shear.
          Rectangle2D bounds = this.shape.getBounds2D();
          double x0 = bounds.getMinX();
          double x1 = bounds.getMaxX();
          double xx0 = domainAxis.valueToJava2D(x0, dataArea, domainEdge);
          double xx1 = domainAxis.valueToJava2D(x1, dataArea, domainEdge);
          double m00 = (xx1 - xx0) / (x1 - x0);
          double m02 = xx0 - x0 * m00;
  
          double y0 = bounds.getMaxY();
          double y1 = bounds.getMinY();
          double yy0 = rangeAxis.valueToJava2D(y0, dataArea, rangeEdge);
          double yy1 = rangeAxis.valueToJava2D(y1, dataArea, rangeEdge);
          double m11 = (yy1 - yy0) / (y1 - y0);
          double m12 = yy0 - m11 * y0;
  
          //  create transform & transform shape
          Shape s = null;
          if (orientation == PlotOrientation.HORIZONTAL) {
              AffineTransform t1 = new AffineTransform(0.0f, 1.0f, 1.0f, 0.0f,
                      0.0f, 0.0f);
              AffineTransform t2 = new AffineTransform(m11, 0.0f, 0.0f, m00,
                      m12, m02);
              s = t1.createTransformedShape(this.shape);
              s = t2.createTransformedShape(s);
          }
          else if (orientation == PlotOrientation.VERTICAL) {
              AffineTransform t = new AffineTransform(m00, 0, 0, m11, m02, m12);
              s = t.createTransformedShape(this.shape);
          }
  
          if (this.fillPaint != null) {
              g2.setPaint(this.fillPaint);
              g2.fill(s);
          }
  
          if (this.stroke != null && this.outlinePaint != null) {
              g2.setPaint(this.outlinePaint);
              g2.setStroke(this.stroke);
              g2.draw(s);
          }
          addEntity(info, s, rendererIndex, getToolTipText(), getURL());
  
      }
  
      /**
       * Tests this annotation for equality with an arbitrary object.
       *
       * @param obj  the object (<code>null</code> permitted).
       *
       * @return A boolean.
       */
      @Override
      public boolean equals(Object obj) {
          if (obj == this) {
              return true;
          }
          // now try to reject equality
          if (!super.equals(obj)) {
              return false;
          }
          if (!(obj instanceof XYShapeAnnotation)) {
              return false;
          }
          XYShapeAnnotation that = (XYShapeAnnotation) obj;
          if (!this.shape.equals(that.shape)) {
              return false;
          }
          if (!ObjectUtilities.equal(this.stroke, that.stroke)) {
              return false;
          }
          if (!PaintUtilities.equal(this.outlinePaint, that.outlinePaint)) {
              return false;
          }
          if (!PaintUtilities.equal(this.fillPaint, that.fillPaint)) {
              return false;
          }
          // seem to be the same
          return true;
      }
  
      /**
       * Returns a hash code for this instance.
       *
       * @return A hash code.
       */
      @Override
      public int hashCode() {
          int result = 193;
          result = 37 * result + this.shape.hashCode();
          if (this.stroke != null) {
              result = 37 * result + this.stroke.hashCode();
          }
          result = 37 * result + HashUtilities.hashCodeForPaint(
                  this.outlinePaint);
          result = 37 * result + HashUtilities.hashCodeForPaint(this.fillPaint);
          return result;
      }
  
      /**
       * Returns a clone.
       *
       * @return A clone.
       *
       * @throws CloneNotSupportedException ???.
       */
      @Override
      public Object clone() throws CloneNotSupportedException {
          return super.clone();
      }
  
      /**
       * Provides serialization support.
       *
       * @param stream  the output stream.
       *
       * @throws IOException if there is an I/O error.
       */
      private void writeObject(ObjectOutputStream stream) throws IOException {
          stream.defaultWriteObject();
          SerialUtilities.writeShape(this.shape, stream);
          SerialUtilities.writeStroke(this.stroke, stream);
          SerialUtilities.writePaint(this.outlinePaint, stream);
          SerialUtilities.writePaint(this.fillPaint, stream);
      }
  
      /**
       * Provides serialization support.
       *
       * @param stream  the input stream.
       *
       * @throws IOException  if there is an I/O error.
       * @throws ClassNotFoundException  if there is a classpath problem.
       */
      private void readObject(ObjectInputStream stream)
          throws IOException, ClassNotFoundException {
          stream.defaultReadObject();
          this.shape = SerialUtilities.readShape(stream);
          this.stroke = SerialUtilities.readStroke(stream);
          this.outlinePaint = SerialUtilities.readPaint(stream);
          this.fillPaint = SerialUtilities.readPaint(stream);
      }
  
  }
  